# frozen_string_literal: true

def solve
  (0..(S.size - 1)).map do |i|
    s = S.chars.rotate(i).join
    # rubocop:todo Security/Eval
    s.stem? ? [(eval s.gsub(/0+(\d+)/) { Regexp.last_match(1) })] : []
    # rubocop:enable Security/Eval
  end.reduce(:+).max
end

class String # rubocop:todo Style/Documentation
  def stem?
    match?(/^[^+-].*[^+-]$/)
  end
end

S = gets.chomp

puts solve